CN1595922A - Wireless communication system, and demodulation method and data rate control method therefor - Google Patents
Wireless communication system, and demodulation method and data rate control method therefor Download PDFInfo
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- CN1595922A CN1595922A CNA2004100022399A CN200410002239A CN1595922A CN 1595922 A CN1595922 A CN 1595922A CN A2004100022399 A CNA2004100022399 A CN A2004100022399A CN 200410002239 A CN200410002239 A CN 200410002239A CN 1595922 A CN1595922 A CN 1595922A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/3488—Multiresolution systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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Abstract
A transmitter and a receiver share a maximum number of transmission bits per symbol as a parameter. The transmitter modulates an encoded and interleaved transmission signal in accordance with a modulation scheme which enables the transmission of one bit or more per symbol, while the receiver demodulates a received signal based on a channel quality in accordance with a modulation scheme which has a higher modulation level as the channel quality is higher. When the number of demodulated bits per symbol is smaller than the maximum number of transmission bits per symbol, the receiver deinterleaves and decodes a received signal after the demodulation on the assumption that the received signal has likelihoods of zero as much as the number of missing bits.
Description
Technical field
The present invention relates to using with error correction symbol and transmitting with 1 symbol in the radio communications system of many-valued modulation of 1 above information, improve the demodulation method and the data rate control method of the gain of transmission line and interference, the quality of reception when noise electric power changes.
Background technology
Transmit the many-valued modulation technique of multidigit information as everyone knows with each symbol for the conveying capacity that in radio communications system, increases each time.
In many-valued modulation technique, because increasing the maximum total communication capacity of transmission line quality when good more more in the figure place of each symbol increases, on the other hand the figure place of each symbol increase more the transmission line quality when low more total communication capacity descend significantly, so proposed the adaptation modulation technique that contrast transmission line quality is switched the many-valued number of modulation in order to carry out stable communication.For the explanation in (the paper will B-IIVol.J78-B-II No.6 pp.435-444 of electronic information communication association, June nineteen fifty-five) etc. of " modulating the transmission characteristic of the variable adaptation modulation system of many-valued number " at paper of this technology.
The processing mode of common transmission data is as follows.In the transmit leg communicator, at first the data that will send are encoded by encoding section.In radio communication, always be to use convolutional encoding and turbine (Turbo) coding, but coding method is not limited thereto, also can uses other coding method as coding method.The code word that is encoded is imported into QAM (Quadrature AmplitudeModulation) adaptation modulation portion and modulates, and by radio station the base band after modulating is liked being transformed to the radio frequency band and transmits.On the other hand, the radio signal that receives via antenna in recipient's radio communications set is transformed to the base band frequency band with radio station, and base band happiness signal at first the demodulation result of QAM demodulation section (likelihood) input decoding part, is deciphered in decoding part.
It is consistent with the many-valued number of the demodulation in recipient's communicator that below these adaptation modulation system needs make the many-valued number of modulation in the transmit leg communicator, specifically the many-valued several m of modulation in the QAM of transmit leg communicator adaptation modulation portion determine as described below.At first use S/A determination part etc. to be determined in recipient's communicator (perhaps) before demodulation transmission line situation in constantly.Below in S/N information issuing portion, make and be used for transmitting the signal of its measurement result to the transmit leg communicator from recipient's communicator, the information of making is modulated the back send in modulation portion.The transmit leg communicator is deciphered this received signal in decoding part, obtain the transmission line situation of S/N information etc.Judge the transmission line situation from acquired S/N information etc., if transmission line in order then modulate with the many-valued modulation of big many-valued number, the many-valued modulation if the transmission line situation is bad with little many-valued number is modulated.This a succession of control is exactly reponse system.
In switching the many-valued number of modulation that adapts to the transmission line change of adopting above-mentioned adaptation modulation technique in the past, because receiving platform is in order to carry out demodulation need know that transmitting station uses in modulation mode, so need receive the information of platform notice modulation system from launch pad butt joint.
And then, when having produced under the wrong situation in the information in this modulation system,, cause the problem of data communication failure, so need communicate with high-precision modulation system because adopt receiving platform to carry out demodulation in incorrect mode.
In addition, as mentioned above because owing to need between transmitting station and receiving platform, make modulation system correctly consistent, generation time delay before causing from mensuration transmission line quality to the change modulation system, so can not switch modulation system aptly at the rapid change of transmission line, have the fully such problem of flexible Application transmission line communication for this reason.
Summary of the invention
Existence in view of above problem, the objective of the invention is to: a kind of information that need not notify correct modulation system between transmitting station and receiving platform is provided, the communication system that just can make the change of the figure place of each symbolic communication and transmission line adapt and switch, and then the communication system of adjusting disposal ability according to the change of transmission line is provided.
As the device that is used to address the above problem, in the communication system in embodiments of the invention 1, transmitting station and receiving platform at first transmit figure place to the maximum of each symbol and share as parameter, because, the modulation system modulation of the coding interlaced transmission signal of transmitting station sending more than 1 with each symbol, the maximum that the figure place of each symbol of modulation system ought not reach above-mentioned each symbol transmits under the situation of figure place, the only discarded figure place that differs is carried out following symbol-modulated, the signal that receiving platform has received with the modulation system modulation that can each symbol sends more than 1, when per 1 figure place of the modulation system after the demodulation when transmitting under the also little situation of figure place than above-mentioned per 1 maximum, as the information that receives the signal that is the likelihood 0 partly of not enough figure place, carry out the later deinterleave of demodulation and decoding is handled, even thereby produce in the modulation system notification of information between transmitting station and receiving platform and wrongly do not communicate with also can having big deterioration in characteristics.And then, between transmitting station and receiving platform, do not need to notify the information of modulation system, because receiving platform is selected the modulation system demodulation of the transmission line quality many-valued number of modulation that the many-valued number of high modulation is high more more according to the transmission line quality, thereby can adapt with the change of transmission line and switch figure place in each symbolic communication.
In addition as solution to the problems described above, in the communication system in embodiments of the invention 2, transmitting station and receiving platform at first transmit figure place to the maximum of each symbol and share as parameter, transmitting station is the transmission signal after staggered with the modulation system modulating-coding that can each symbol sends more than 1, when reaching above-mentioned per 1 maximum, the figure place of each symbol of modulation system do not transmit under the situation of figure place, the only discarded figure place that differs is carried out the modulation of next symbol, receiving platform carries out demodulation with the modulation system that can transmit figure place with the maximum of 1 above-mentioned each symbol of symbol transmission, in the signal after demodulation, behind the absolute value of the likelihood of the signal that reduces to be equivalent to be dispensed on the position on the symbol low level position according to the transmission line quality, carry out later deinterleave of demodulation and decoding processing, need between transmitting station and receiving platform, not notify the information of modulation system, just can adapt and switch the figure place of each symbolic communication with the change of transmission line.
And then, a kind of system is provided, by in embodiments of the invention 1 and embodiment 2 jointly, success or failure to the decode results of transmitting station notice in receiving platform, if transmitting station is notified decoding failure, then send with the information identical with the signal of having notified decoding failure is the code word of basic coding, a part that has sent or a part that does not also send, send necessary full information amount by the transmission line basis accordingly with the many-valued number of the actual modulation that can receive of receiving platform thus, can use best throughput communication according to the change of transmission line.
If employing the present invention, the information that need not notify modulation system between transmitting station and receiving platform then can be provided, just can adapt and switch the figure place of each symbolic communication with the change of transmission line, in addition, the system that can communicate with the disposal ability of the best according to the change of transmission line.
Description of drawings
Fig. 1 is the 1st example of the modulation demodulation system among the present invention.
Fig. 2 is the 2nd example of the modulation demodulation system among the present invention.
Fig. 3 is the formation example of the transmitting station among embodiment 1 and the embodiment 2.
Fig. 4 is the formation example of the receiving platform among the embodiment 1.
Fig. 5 is the formation example of the receiving platform among the embodiment 2.
Fig. 6 is the 1st example of the likelihood coefficient among the embodiment 2.
Fig. 7 is the 2nd example of the likelihood coefficient among the embodiment 2.
Fig. 8 is the flow process that sends control again among embodiment 1 and the embodiment 2.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.Below explanation is set to 6 as the maximum transmission figure place of each symbol of example, in transmitting station, modulate with 64QAM, the mode of in receiving platform, modulating with 64QAM or 16QAM or QPSK mode, but of the present invention being suitable for is not limited to these maximum figure place and modulation systems of transmitting, more generally be to transmit figure place in the maximum of each symbol to be set to the 2m position, in transmitting station with 2
2mQAM modulation, in receiving platform with 2
2kCan be suitable for too during QAM modulation (k is the following natural number of m) modulation.4QAM under the situation of hypothesis k=1 represents the modulation system same with QPSK in above-mentioned in addition.
Fig. 1 shows the ideograph of the execution mode 1 of modulation-demo-demodulation method of the present invention.Between transmitting station 110 and receiving platform 120, at first, determine the maximum traffic bit of each symbol.The maximum of each symbol transmits figure place, when the communication between transmitting station 110 and receiving platform 120 begins, perhaps in the communication, can notify to another radio station from a certain radio station aptly, also can use the intrinsic value of predetermined system.
In transmitting station 110, the data-signal of at first using communication road symbolic coding in encoding section 111, to send, encoded data-signal is interlocked in staggered portion 112.
In demodulation section 113, ranked 115 each maximum figure place that send by the signal that interlock for each symbol, in the example of Fig. 1, be divided into 6, be assigned to respectively on each signaling point of modulation symbol and send from transmitting station after the debugging.
At this moment, if the transmission figure place of each symbol of the modulation system of using in modulation is also littler than the maximum transmission figure place of above-mentioned each symbol, then only use the traffic bit numeral system of each symbol of the modulation system of in modulation, using to become modulation symbol.Under the situation of Fig. 1 example, in 6 that prepare for modulation symbol makes, for example under situation, only use 4 and make modulation symbol with the 16QAM modulation, remaining 2 are not used.
In receiving platform 120, during demodulate reception arrives in demodulation section 123 symbol, the transmission line quality when receiving according to symbol is with having the high more modulation system demodulation of the many-valued number of high modulation more of transmission line quality.In the example of Fig. 1, under the highest situation of transmission line quality,, under the low-quality situation of transmission line, carry out demodulation with 16QAM with the 64QAM demodulation, under lower situation, carry out demodulation with QPSK, make restituted signal row 124.
At this, under the situation of the modulation system demodulation that transmits the little transmission figure place of figure place with maximum than each symbol, give restituted signal row 124 likelihood that directly obtains for demodulated position, give the restituted signal row likelihood 0 for not enough bit position by demodulation.
Restituted signal row 124 in deinterleave portion 122 by deinterleave after, in decoding part 121, communicate the decoding of road symbol.In the decoding of communication road symbol, be given the likelihood 0 of separating the not enough position of timing and can harmful effect do not arranged the likelihood that is given other with the modulation system of the low many-valued number of modulation, because only give and the encoding rate of the road symbol of the communicating by letter same effect that rises, so can correctly decipher.
At above so-called transmission line quality height, be meant situation and the low situation of noise electric power that for example received signal electric power is high, interfere the low situation of electric power, the high situation of SINR (signal is to the ratio of interference and noise electric power), the situation that BER (position Error Rate) is high etc., delivery quality is low be meant with it opposite.
In addition, for modulation-demo-demodulation method of the present invention, also can be the implementation method of change likelihood after demodulation.As the 2nd implementation method, is in this case modulation-demo-demodulation method base description with the ideograph of Fig. 2.
The same with the situation of Fig. 1, between transmitting station 110 and receiving platform 120, determine that at first the maximum of each symbol transmits figure place.
In transmitting station 110, the data-signal of at first in encoding section 111, using communication road symbolic coding to send, encoded data-signal is interlocked in staggered portion 112.In modulation portion 113, ranked 115 maximum traffic bits by the signal that interlock to each symbol, in the example of Fig. 2, be divided into each 6, and be distributed in respectively that modulation then sends from transmitting station on each signaling point of modulation symbol.
At this moment, also little if the transmission figure place of each symbol of the modulation system of using in modulation transmits figure place than above-mentioned per 1 maximum, the traffic bit numeral system that then only is used in each symbol of the modulation system of using in the modulation becomes modulation symbol.Under the situation of Fig. 2 example, in prepare making 6, for example making modulation symbol with 4 with following of the situation of 16QAM modulation for modulation symbol, remaining 2 are not used.
In receiving platform 120, in demodulation section 123, at first transmit the symbol that the modulation system demodulation of figure place has received with the maximum that is equivalent to each symbol, make restituted signal row 124.
From restituted signal row 124, the delivery quality when receiving demodulated symbol, the likelihood of signal that is equivalent to the low level position of modulation symbol if the transmission line quality is low is set to 0 and makes likelihood control back restituted signal row 125.At this, the low more position likelihood until a high position of delivery quality is set to 0.
Likelihood control back restituted signal row 125 in deinterleave portion 122 by deinterleave after, in decoding part 121, communicate the decoding of line code.In the decoding of communication line symbol, can harmful effect not arranged in the likelihood 0 that gives not enough position of separating timing with the modulation system of the low many-valued number of modulation to the likelihood that is given another one, because only give and the encoding rate of the road symbol of the communicating by letter identical effect that rises, use can correctly be deciphered.
In addition, in the example of Fig. 2, the likelihood that is low level position when the making of likelihood control back restituted signal row 125 is set to 0, but likelihood all is not set to 0 and it is dropped to than the result behind the likelihood absolute value of demodulation low level position is also low can obtain same effect yet.In order to realize this purpose, along with the increase (raising) of transmission line quality has non-negative slope variation, by multiply by the little non-negative coefficient of the such absolute value in symbol low level position that is equivalent to signal train, can make likelihood control back restituted signal row 125 restituted signal row 124 merchants.
More than, illustrate about 2
2mQAM has illustrated modulation system, but of the present invention being suitable for is not limited to 2
2mQAM for example so long as use the gray symbol to return ground spread signal point configuration again, can set the modulation system that the position of signaling point is distributed and just can be suitable for, per 1 maximum transmission figure place as the m position, to 2
mPSK and 2
mASK also can be suitable for same control.
Below, the transmitting station that communicates according to the modulation demodulation system of using the invention described above and the pie graph of receiving platform illustrate the formation of transmitting station and receiving platform and the flow direction of signal.
But below explanation only is suitable for the formation of modulation demodulation system of the present invention in the communication from the transmitting station to the receiving platform, but also can be suitable for the present invention from receiving platform to the communication of transmitting station when implementing.In addition, the transmitting station among the present invention and the term of receiving platform, can use with the radio station of the data signal modulation that is sent out and the meaning of carrying out the radio station of demodulation, all also can as the base station portable terminal, in addition, 1 couple 1 that communication means of the present invention is adapted between the terminal installation communicates by letter.
Fig. 3 is the formation of the transmitting station shared when being suitable for the 1st and the 2nd implementation method of where applicable of the present invention, and Fig. 4 is the formation of the receiving platform when being suitable for the 1st implementation method of the present invention, the formation of the receiving platform when Fig. 5 provides the 2nd implementation method of the present invention.
Below, according to Fig. 3 and Fig. 4, the formation when being suitable for the 1st implementation method of the present invention and the flow direction of signal are described.
In the transmitting station of Fig. 3, send data quilt communication road symbolic coding in encoding section 211, in staggered portion 212,, be stored in the preceding buffer 214 of modulation by staggered.The data based request signal that sends again that is stored in the preceding buffer 214 of modulation is sent in multiplexed/modulation portion 213, by what between transmitting station and receiving platform, determine in advance, the perhaps intrinsic modulation system of system or should modulate the also little modulation system modulation of many-valued number and pilot signal is multiplexed after sent by radio station 200 than modulation system.
The signal that is sent by transmitting station receives in the wireless part 300 of the receiving platform of Fig. 4.In the signal that receives in wireless part 300, pilot signal is sent to transmission line with guiding extraction unit 325-2 extraction and infers portion 324.Infer the signal amplitude and the phase place change of inferring in the portion 324 in transmission line at transmission line, notice detection demodulation section 323-1 is in addition measured signal electric power and noise electric power, the transmission line quality information notice demodulation mode determination portion 326 of interfering electric power etc. to be tried to achieve.In demodulation mode determination portion 326, according to this transmission line quality information, determine modulation system, if make as mentioned above transmission line quality height then to modulate many-valued number high, and notice detection demodulation section 323-1.
In the signal that in wireless part 300, receives,, deliver to detection demodulation section 323-1 after in data extraction unit 325-1, being drawn out of on the other hand from the data-signal of transmitting station notice receiving platform.In detection demodulation section 323-1, with the demodulation mode by demodulation mode determination portion 326 notices, amplitude and phase place transition information demodulated data signal according to inferred portion's 324 notices by transmission line send to deinterleave portion 322 to restituted signal.At this, when the modulation system by demodulation mode determination portion 326 notices is than modulating under the situation of the also little modulation system of numerical value in the modulation system of determining between transmitting station and the receiving platform in advance, with the part of the figure place deficiency of each symbol just method as the signal that has received likelihood 0, append restituted signal, send to deinterleave portion 322.
In deinterleave portion 322, the restituted signal deinterleave sending sends to decoding part 321 to the result of deinterleave.
In decoding part 321, in decoding, had sufficient information by the signal after the demodulation then decipher if be judged as.
In order to realize the resend functionality of data, has following formation.In decoding part 321, under successfully decoded situation, send request generating unit 315 again not needing to send again notice, and, needs are sent notice again send request generating unit 315 again under the situation of decoding failure or under the situation about deciphering.
In sending request generating unit 315 again, according to the needs that send again of notice from decoding part 321 not needs make and send request signal again.
When coding is arranged from receiving platform encoding section 311, from receiving platform under the situation of the data-signal that transmitting station sends, in staggered portion 312 by the data-signal after staggered and the request signal of in sending request generating unit 315 again, making of transmission again and pilot signal in multiplexed/modulation portion 313 by multiplexed and modulation, send by wireless part 300.
The signal that sends from receiving platform is received the radio station 200 of the transmitting station of Fig. 3.In the signal that in radio station 200, is received, pilot signal is drawn out of in guiding extraction unit 225-2, infer the amplitude and the phase place change of inferring the signal in transmission line in the portion 224 from this pilot signal at transmission line, amplitude after this quilt is inferred and phase place change notified detection demodulation section 223-1 and 223-3.
When sending under the situation of data-signal to transmitting station from receiving platform, in the signal that in radio station 200, receives, be drawn out of among data-signal extraction unit 225-1 from the data-signal of receiving platform notice transmitting station, use is inferred information demodulation in detection demodulation section 223-1 of the amplitude of inferring out in the portion 224 and phase place change at transmission line, in deinterleave portion 222 by deinterleave, decoded in decoding part 221, make the reception data.
In radio station 200, receive in the signal, sending request signal again is drawn out of in sending request extraction unit 225-3 again, use is inferred the information that is pushed the amplitude made and phase place change in the portion 224, demodulation in detection demodulation section 223-3, buffer 214 before the notice modulation at transmission line.
Before modulation in the buffer 214, if notified and to have sent again from receiving platform, then output encoder signal the identical or different part of the signal identical data that sends again with needs with signal that sent, if when receiving platform notice does not need to send again, just export a part of the data different with the signal that does not need to send again having been carried out encoded signals.Send control again by this, the signal according to actual demodulation in receiving platform sends necessary data fully, can expect that the throughput of data communication improves.
In addition, below according to Fig. 3 and Fig. 5 illustrate formation when being suitable for the 2nd implementation method of the present invention and signal flow to.
In the transmitting station of Fig. 3, send data quilt communication road symbolic coding in encoding section 211, in staggered portion 212, interlocked, and be stored in the preceding buffer 214 of modulation.
The data based request signal that sends again that is stored in the preceding buffer 214 of modulation sends in multiplexed/modulation portion 213, with what between transmitting station and receiving platform, determine in advance, the perhaps intrinsic modulation system of system or modulate the also little modulation system modulation of many-valued number than this modulation system, with pilot signal multiplexed after, send via radio station 200.
The signal that is sent by transmitting station is received in the wireless part 300 of the receiving platform of Fig. 4.In the signal that in wireless part 300, receives, send to transmission line after pilot signal is drawn out of and infer portion 324 in guiding extraction unit 325-2.Infer the amplitude and the phase place change of inferring the signal in transmission line in the portion 324 at transmission line, notice detection decoding part 323-1 counts configuration part 327 to measured signal electric power and noise electric power, the transmission line quality information notice likelihood of interfering electric power etc. to be tried to achieve in addition.
Count in the configuration part in likelihood,, each of symbol is asked the likelihood coefficient of taking advantage of likelihood, notice likelihood control part 328 according to the transmission line quality that can see.
On the other hand, in the signal that in wireless part 300, receives, notify the data-signal of receiving platform among data extraction unit 325-1, to be drawn out of from transmitting station and send to detection demodulation section 323-1.Modulation system to determine between transmitting station and receiving platform in advance in detection demodulation section 323-1, amplitude and phase place transition information demodulated data signal according to inferred portion's 324 notices by transmission line send to restituted signal in the likelihood control part 328.
In likelihood control part 328, for the restituted signal that sends from detection demodulation section 323-1 separately, according to being to make likelihood control back restituted signal by the likelihood coefficient of likelihood coefficient settings portion 327 notices, send to deinterleave portion 322 with who corresponding signal times of symbol.
In deinterleave portion 322, the likelihood control back restituted signal that is sent is carried out deinterleave, the result behind the deinterleave is sent to decoding part 321.
In decoding part 321, have enough information concerning decoding then decipher if be judged as signal through demodulation.
For the resend functionality of data-signal, has following formation.In decoding part 321, send request generating unit 315 again when following of successfully decoded situation does not need to send notice again, under the situation of decoding failure or following needss of situation about deciphering sends again and notifies transmission again to ask generating unit 315.
In sending request generating unit 315 again, according to from the needs of transmission again of decoding part 321 notices not needs make and send request signal again.
When having from radio station, in encoding section 311, encode, send to from radio station under the situation of data-signal of sending part, in staggered portion 312 by staggered data-signal and the request signal of in sending request generating unit 315 again, making of transmission again and pilot signal in multiplexed/modulation portion 313 by multiplexed and modulation, send by wireless part 300.
Having from receiving platform under the situation of the data-signal that transmitting station sends, the signal that sends from receiving platform receives the wireless part 200 of the transmitting station of Fig. 3.In the signal that in radio station 200, receives, pilot signal is drawn out of in guiding extraction unit 225-2, infer the amplitude and the phase place change of inferring the signal transmission line in the portion 224 from this pilot signal at transmission line, amplitude that this quilt is inferred and phase place change notified detection demodulation section 223-1 and 223-3.In the signal that in radio station 200, receives, be drawn out of among data-signal extraction unit 225-1 from the data-signal of receiving platform notice transmitting station, the information that use is inferred in the portion 224 amplitude of being inferred and phase place change at transmission line in detection demodulation section 223-1 by demodulation, in deinterleave portion 222 by deinterleave, decoded in decoding part 221, make the reception data.
In the signal that in wireless part 200, receives, sending request signal again is drawn out of in sending request extraction unit 225-3 again, the information that use is inferred in the portion 224 amplitude of being inferred and phase place change at transmission line in detection demodulation section 223-3 by demodulation, buffer 214 before the notice modulation.
Before modulation in the buffer 214, if notified and to have sent again from receiving platform, then output encoder signal the identical or different part of the signal identical data that sends again with needs with signal that sent, if when receiving platform notice does not need to send again, then output encoder with the part of the signal that does not need to send again the different data of signal.Send control again by this, in receiving platform, send the data-signal of abundant needs, can expect that the throughput of data communication improves according to the signal of actual demodulation.
By being chosen in the likelihood data of setting in the above-mentioned likelihood coefficient settings portion 327, make that the good more likelihood data of quality of transmission line are big more, in addition as big high-order of the symbol, improve the characteristic of demodulation mode of the present invention.
But may not need dull increasing in this so-called increase, also the inclination of transmission line quality is 0 relatively, in addition can also be identical with low level position intermediate value in the high-order position of symbol.
Example when Fig. 6 shows likelihood coefficient when using SNIR (signal is interfered and the ratio of noise electric power relatively) to find the solution the signal that accent sends with 64QAM.Everybody the likelihood coefficient 401 and 402 of removing most significant bits is that 0 or 12 values are got on the boundary with separately the threshold value that has, by using this likelihood coefficient, likelihood according to transmission line quality low level position is set to 0, can obtain and is that the modulation system of low many-valued number is separated the same effect of timing to have embodiment 1.
The another example of the likelihood coefficient when Fig. 7 shows the signal that demodulation sends with 64QAM in addition.Remove most significant bits everybody the likelihood coefficient as have as delivery quality high more big more the function representation of positive slope, when the transmission line quality reduces because the likelihood of low level position is descended, thereby can carry out as with modulation system when communication with low many-valued number of modulation, can carry out stable communication though maximum throughput is low, when the transmission line quality is high because whole likelihood is not descended, thereby the high maximum throughput communication can be with communication under the modulation system of the high many-valued number of modulation the time.
In the foregoing description 1 and embodiment 2, in sending request generating unit 315 again, make the combination that the index that is illustrated in symbol successfully decoded in the decoding part 321 and expression do not need the combination of the signal that sends again or be illustrated in the index and the signal that the expression needs send again of the symbol of decoding failure in the decoding part 321, the index and the expression that perhaps are illustrated in the symbol of deciphering as the information deficiency in the decoding part 321 need one of combination of the signal of transmission again, from receiving platform transmitting station are sent as sending request signal again.
In the foregoing description 1 and embodiment 2,, for example can handle like that with the flow process of Fig. 8 for the storage and the transmission of data behind the coding in the buffer before modulation 214.
In the flow process of Fig. 8, modulate preceding buffer 214, the transmission storage after decoded and quilt are interlocked is divided into N piece to each code word in each code word.Be sent in each piece by the code word after cutting apart, if from receiving platform send again that request signal is represented not need to send again the transmission of this code word finish, carry out the transmission of another code word.On the other hand, if represent to send again then send the piece different with the piece of the destination that sends to same code word from the request signal that sends again of receiving platform.At this, all send end if cut apart N piece of same code word, then send and send to the same piece of piece of repetition destination.But the flow chart at this and Fig. 8 is different, can also be when each the repetition dividing method of change piece.In addition, if about certain code word, the piece number that is sent is that maximum number of repetitions is more than M time, then as sending the transmission that failure finishes this code word.In receiving platform, under the situation of representing not need to send again when successfully decoded transmission that sends request signal again, finish the reception of the code word of reception before this, begin the reception of code word of future generation.In addition, need under the situation that sends request signal again of transmission again when decoding failure has sent expression, receiving platform then receives the piece of same code word, has had sufficient information if be judged as in decoding, then attempts decoding once more.
In the foregoing description 1 and embodiment 2, decoding in decoding part 321 has the judgement of sufficient information, can judge by following condition, promptly be sent to decoding part 321 signal likelihood absolute value and for more than the certain value, can be certain value according to the summation of the communication line capacity of inferring signal that the signal noise of inferring in the portion 224 recently infers each frequency band when receiving at transmission line perhaps, for example be more than the figure place of the received signal after the decoding.
Claims (20)
1. a radio-transmitting station sends signal to radio receiving station, it is characterized in that: comprising:
The encoding section that above-mentioned transmission signal is encoded;
Storage is buffer before the modulation of the transmission signal of above-mentioned coding;
The 1st of the transmission figure place of each symbol of conduct in this radio-transmitting station transmits figure place, transmits the modulation portion of any one mode to modulating through the transmission signal of above-mentioned coding in the 2nd multiple modulation system that transmits below the figure place of figure place with the maximum as predetermined each symbol;
Transmission is through the wireless part of the transmission signal of above-mentioned modulation;
About the above-mentioned the 2nd information that transmits figure place be and above-mentioned radio receiving station Sharing Information;
The transmission signal that is used for above-mentioned modulation, before above-mentioned modulation the buffer by each the above-mentioned the 2nd transmit figure place and be read out after, be imported in the above-mentioned modulation portion, above-mentioned modulation portion is modulated the above-mentioned the 1st transmission signal that transmits figure place in the above-mentioned transmission signal that is transfused to, and the above-mentioned the 2nd transmission signal that transmits the difference of figure place and above-mentioned the 1st transmission figure place is not modulated.
2. radio-transmitting station according to claim 1 is characterized in that:
By before sending at above-mentioned transmission signal the information about above-mentioned the 2nd transmission figure place is sent to above-mentioned radio receiving station, with the shared information of this radio receiving station about above-mentioned the 2nd figure place.
3. radio-transmitting station according to claim 1 is characterized in that:
According to the request signal of transmission again that sends from above-mentioned radio receiving station, send again by this send again request signal specific, be stored in that the coding in the buffer sends signal before the above-mentioned modulation.
4. radio-transmitting station according to claim 1 is characterized in that:
The coding that is stored in the preceding buffer of above-mentioned modulation sends signal, is split into a plurality of by each code word, is imported in the above-mentioned modulation portion by each piece;
Input by above-mentioned each piece to above-mentioned modulation portion, controlled according to the request signal of transmission again that receives from above-mentioned radio receiving station, when the above-mentioned request signal that sends again that receives is illustrated in when not needing to send the above-mentioned code word of above-mentioned transmission signal again in this radio receiving station, stop to send this code word, carry out the transmission of the next code word of this code word and handle.
5. a radio receiving station receives the signal that sends from the radio-transmitting station, it is characterized in that: comprising:
Receive the wireless part of above-mentioned signal;
Transmit figure place as the 3rd of the transmission figure place of each symbol, any one mode in the 4th multiple modulation system that transmits below the figure place of figure place of transmitting with predetermined maximum as each symbol is to carrying out the demodulation section of demodulation through the received signal of above-mentioned reception; With
To carrying out decoders for decoding through above-mentioned demodulated received signal;
About the information of above-mentioned the 4th transmission figure place, share with above-mentioned radio-transmitting station;
Symbol of the every demodulation of above-mentioned demodulation section, just export the above-mentioned the 4th transmit figure place through the demodulated received signal.
6. radio receiving station according to claim 5 is characterized in that:
Has the transmission line quality judging part of judging the transmission line quality between this radio receiving station and the above-mentioned radio-transmitting station;
Decide the above-mentioned the 3rd to transmit figure place according to transmission line quality through this judgement.
7. radio receiving station according to claim 6 is characterized in that:
Above-mentioned transmission line quality judging part uses the signal that receives from above-mentioned radio-transmitting station, carries out the judgement of above-mentioned transmission line quality.
8. radio receiving station according to claim 5 is characterized in that:
Symbol of the every demodulation of above-mentioned demodulation section, just output comprises the restituted signal row of the likelihood information of above-mentioned transmission figure place, transmits figure place and the above-mentioned the 3rd low level position of transmitting the difference of figure place, near the likelihood the output 0 or 0 for the above-mentioned the 4th.
9. radio receiving station according to claim 5 is characterized in that:
From the notification of information of above-mentioned radio-transmitting station reception about above-mentioned the 4th transmission figure place.
10. radio receiving station according to claim 5 is characterized in that:
From the information of above-mentioned radio-transmitting station reception, decide the above-mentioned the 3rd to transmit figure place according to this information about the transmission figure place of each symbol the above-mentioned radio-transmitting station.
11. radio receiving station according to claim 5 is characterized in that:
The signal that each piece after the reception of above-mentioned radio-transmitting station has been divided into a plurality of by each code word sends is also stored, above-mentioned decoding part is deciphered part or all the received signal of piece that is equivalent to code word, according to above-mentioned decoding whether successfully make expression this whether success the request signal of transmission again and send.
12. radio receiving station according to claim 11 is characterized in that:
When being judged as when the received signal of above-mentioned storage comprises information enough concerning decoding, carry out above-mentioned decoding.
13. radio receiving station according to claim 11 is characterized in that:
When having sent to above-mentioned radio-transmitting station when representing the above-mentioned successfully decoded request signal of transmission again, stop to receive the above-mentioned code word that has received, this sends request signal and the piece corresponding with the next code word of above-mentioned code word that send again to begin to receive response.
14. a signal sending and receiving methods is from the signal sending and receiving methods of the 1st radio station to the radio communications system of the 2nd radio station transmission signal, it is characterized in that:
The relevant information of the 1st transmission figure place that transmits figure place with the maximum as each symbol is shared with above-mentioned the 2nd radio station by above-mentioned the 1st radio station;
Above-mentioned the 1st radio station,
Above-mentioned transmission signal is encoded,
In modulation portion, the 2nd of the transmission figure place of each symbol of conduct in above-mentioned the 1st radio station transmits figure place, in any one mode in the above-mentioned the 1st multiple modulation system that transmits below the figure place transmission signal through above-mentioned coding is modulated,
Transmission is through the transmission signal of above-mentioned modulation,
In above-mentioned modulation portion, transmission signal through above-mentioned coding is imported into above-mentioned modulation portion by each above-mentioned the 1st transmission figure place, the above-mentioned the 2nd transmission signal that transmits figure place in the above-mentioned transmission signal that is transfused to is modulated, the above-mentioned the 1st transmission signal that transmits the difference of figure place and above-mentioned the 2nd transmission figure place is not modulated;
Above-mentioned the 2nd radio station,
Reception is from the transmission signal of above-mentioned the 1st radio station,
The 3rd of the transmission figure place of each symbol of conduct in above-mentioned the 2nd radio station transmits figure place, in any one mode in the above-mentioned the 1st multiple modulation system that transmits below the figure place received signal through above-mentioned reception is carried out demodulation,
In demodulation section, to deciphering through above-mentioned demodulated received signal,
Symbol of the every demodulation of above-mentioned demodulation section, just export the above-mentioned the 1st transmit figure place through the demodulated received signal.
15. signal sending and receiving methods according to claim 14 is characterized in that:
Above-mentioned the 1st radio station transmits figure place to the above-mentioned the 1st and notifies above-mentioned the 2nd radio station.
16. signal sending and receiving methods according to claim 14 is characterized in that:
Above-mentioned the 1st radio station transmits figure place to the above-mentioned the 2nd and notifies above-mentioned the 2nd radio station;
Above-mentioned the 2nd radio station transmits figure place according to the above-mentioned the 2nd and decides the above-mentioned the 3rd to transmit figure place.
17. signal sending and receiving methods according to claim 14 is characterized in that:
Above-mentioned the 2nd radio station infer according to the signal that receives from above-mentioned the 1st radio station and above-mentioned the 1st radio station between the transmission line quality, according to decide the above-mentioned the 3rd to transmit figure place through above-mentioned transmission line quality of inferring.
18. signal sending and receiving methods according to claim 14 is characterized in that:
Send above-mentioned transmission signal being divided into a plurality of respectively as code word through the transmission signal of above-mentioned coding;
Above-mentioned the 2nd radio station deciphers part or all the piece that is equivalent to above-mentioned code word, the above-mentioned decoding of expression whether the request signal of transmission again of success send to above-mentioned the 1st radio station.
19. signal sending and receiving methods according to claim 18 is characterized in that:
Above-mentioned when successfully decoded when representing through the request signal of transmission again of above-mentioned transmission, above-mentioned the 1st radio station stops to send the piece of above-mentioned code word, the transmission that begins to carry out the next code word of above-mentioned code word is handled, above-mentioned the 2nd radio station finishes the reception of above-mentioned successfully decoded code word and handles, and the reception that begins to carry out the next code word of this code word is handled.
20. signal sending and receiving methods according to claim 18 is characterized in that:
When the request signal of transmission again of above-mentioned transmission is represented above-mentioned decoding failure, above-mentioned the 1st radio station carries out the transmission of at least 1 identical or different piece of the code word identical with this code word, above-mentioned the 2nd radio station proceeds the reception of this code word and handles, and when the piece that receives more than 1, attempt once more deciphering.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP317708/2003 | 2003-09-10 | ||
| JP2003317708A JP4100304B2 (en) | 2003-09-10 | 2003-09-10 | Wireless communication system, demodulation method thereof, and data rate control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1595922A true CN1595922A (en) | 2005-03-16 |
| CN100571231C CN100571231C (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100022399A Expired - Fee Related CN100571231C (en) | 2003-09-10 | 2004-01-16 | Radio communications system and demodulation method thereof and data rate control method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7095996B2 (en) |
| JP (1) | JP4100304B2 (en) |
| KR (1) | KR101026595B1 (en) |
| CN (1) | CN100571231C (en) |
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| CN101243710B (en) * | 2005-08-16 | 2011-10-12 | 日本电气株式会社 | Wireless communication system radio-parameter deciding method and apparatus |
| CN102369672A (en) * | 2008-12-04 | 2012-03-07 | 宇宙桥有限公司 | System and method of generating soft bits |
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| JP4412181B2 (en) * | 2005-01-21 | 2010-02-10 | 株式会社日立製作所 | Adaptive modulation method and coding rate control method |
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| US20100110959A1 (en) * | 2007-01-26 | 2010-05-06 | Shinya Shimobayashi | Mobile communication system, terminal device, base station device and data communication method |
| US9686045B2 (en) | 2007-04-04 | 2017-06-20 | Lantiq Beteiligungs-GmbH & Co. KG | Data transmission and retransmission |
| JP5326976B2 (en) * | 2009-09-30 | 2013-10-30 | 富士通株式会社 | Wireless communication apparatus, error correction method, and error correction program |
| CN105379155B (en) | 2013-03-14 | 2019-06-14 | 皮斯基克有限公司 | Method and apparatus for being carried out wireless communication via predefined sequence |
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| US10411862B2 (en) * | 2015-05-06 | 2019-09-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Inserting and extracting control data using frequency components |
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- 2003-12-11 KR KR1020030090018A patent/KR101026595B1/en not_active IP Right Cessation
-
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- 2004-01-16 CN CNB2004100022399A patent/CN100571231C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101243710B (en) * | 2005-08-16 | 2011-10-12 | 日本电气株式会社 | Wireless communication system radio-parameter deciding method and apparatus |
| CN102369672A (en) * | 2008-12-04 | 2012-03-07 | 宇宙桥有限公司 | System and method of generating soft bits |
Also Published As
| Publication number | Publication date |
|---|---|
| US20050054319A1 (en) | 2005-03-10 |
| US7095996B2 (en) | 2006-08-22 |
| KR101026595B1 (en) | 2011-04-04 |
| JP4100304B2 (en) | 2008-06-11 |
| JP2005086594A (en) | 2005-03-31 |
| CN100571231C (en) | 2009-12-16 |
| KR20050026843A (en) | 2005-03-16 |
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